题型:判断题 Our teacher is very kind to us. So we regard her ________our best friend. A.onB.toC.asD.at 查看答案
题型:判断题 苯环νC=CA.3300~2300cm-1B.1760~1695cm-1C.1610~1580cm-1D.1310~1190cm-1E.750cm-1 阿司匹林红外吸收光谱中主要特征峰的波数是 查看答案